EP1837969B1 - Method for assembling superconducting cable connecting section - Google Patents
Method for assembling superconducting cable connecting section Download PDFInfo
- Publication number
- EP1837969B1 EP1837969B1 EP05806918A EP05806918A EP1837969B1 EP 1837969 B1 EP1837969 B1 EP 1837969B1 EP 05806918 A EP05806918 A EP 05806918A EP 05806918 A EP05806918 A EP 05806918A EP 1837969 B1 EP1837969 B1 EP 1837969B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cable core
- insulating tube
- cable
- thermal insulating
- assembling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/14—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for joining or terminating cables
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/20—Cable fittings for cables filled with or surrounded by gas or oil
- H02G15/24—Cable junctions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/68—Connections to or between superconductive connectors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/34—Cable fittings for cryogenic cables
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49194—Assembling elongated conductors, e.g., splicing, etc.
- Y10T29/49195—Assembling elongated conductors, e.g., splicing, etc. with end-to-end orienting
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/53—Means to assemble or disassemble
- Y10T29/5313—Means to assemble electrical device
- Y10T29/532—Conductor
- Y10T29/53209—Terminal or connector
- Y10T29/53213—Assembled to wire-type conductor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/53—Means to assemble or disassemble
- Y10T29/5313—Means to assemble electrical device
- Y10T29/532—Conductor
- Y10T29/53209—Terminal or connector
- Y10T29/53213—Assembled to wire-type conductor
- Y10T29/53217—Means to simultaneously assemble multiple, independent conductors to terminal
Definitions
- the present invention relates to a method for assembling a connecting part of superconducting cables. More specifically, it relates to a method for assembling a connecting part of superconducting cables by which the outside diameter of the connecting part can be reduced.
- a structure in which three cable cores are twisted together and accommodated in a thermal insulating tube for example, Patent Document 1 and Patent Document 2.
- These cores have, in order from the center, a former, a conductive layer, an insulating layer, a shielding layer, and a protective layer.
- the stranding of the cable cores is slackened in advance.
- the forming process is performed as shown in FIG. 5 .
- one of the superconducting cables to be connected is prepared ( FIG. 5(A) ).
- one end of the thermal insulating tube 100 of this cable is cut, so as to expose the cable cores 200 from the end of the cut thermal insulating tube 100 by a length necessary for the forming work of the connecting part, with the position of a cap 300 attached to the ends of the cable cores 200 being fixed ( FIG. 5 (B) ).
- the thermal insulating tube 100 of the superconducting cable is held in this state.
- the thermal insulating tube 100 is fixed to the ground with a fixing jig 400 ( FIG. 5 (C) ).
- the exposed cable cores 200 are untwisted, and the ends of the cable cores 200 are separated ( FIG. 5 (D) ).
- Connecting structures 710 like those described in Patent Document 3 are formed between the cable cores 200 abutted against each other ( FIG. 5 (E) ).
- the formers of the superconducting cables abutted against each other are covered with connecting sheaths, and then the connecting sheaths are compressed.
- a coolant layer 720 covering all these connecting structures 710 is formed.
- a vacuumed vessel 730 is formed outside the coolant vessel 720.
- a connecting part 700 is formed ( FIG. 5 (F) ).
- the above-described method for assembling a connecting part has a problem where the outside diameter of the connecting part is large.
- the connecting structures In order to form the connecting structures, it is necessary to untwist the cable cores and to separate the ends of the cable cores sufficiently to perform the forming work of the connecting structures. Therefore, the cable cores with connecting structures are spaced from each other.
- the compressive parts are lengthened in the longitudinal direction with the compression. As a result, the sum of the length of the cable cores exposed between the ends of the thermal insulating tubes in the superconducting cables abutted against each other and the length of the connecting structures after compression is longer than the sum of those lengths before compression. For this reason, the exposed cable cores and the connecting structures are disposed, being slackened in the radius direction of the superconducting cables. This increases the outside diameter of the connecting part.
- the present invention is made in consideration of the above-described circumstances. Its main object is to provide a method for forming a connecting part of superconducting cables by which the outside diameter of the connecting part can be reduced.
- the present invention is a method for assembling a connecting part of superconducting cables, to form a connecting part at an end of a superconducting cable including a thermal insulating tube and a cable core accommodated therein.
- the method includes the following steps: the step of holding the thermal insulating tube with an end of the cable core exposed from the thermal insulating tube, at the end of the superconducting cable; the step of forming a connecting structure at the end of the cable core; and the step of pushing back the cable core into the thermal insulating tube by a predetermined length.
- the cable core is pushed back into the thermal insulating tube by a predetermined length. Therefore, the slack of the cable core exposed from the thermal insulating tube of the superconducting cable can be reduced. By this reduction in slack, the size in the radius direction of the connecting part can be reduced.
- the superconducting cables to which the method of the present invention is applied include all cables having a superconductor. Typically, they have a structure in which a cable core is accommodated in a thermal insulating tube. Normally, a thermal insulating tube has a double pipe structure of an inner pipe and an outer pipe. The space between both pipes is evacuated, and a thermal insulation such as a super insulation is disposed there.
- the cable core can have a structure including, for example, in order from the center, a former, a conductive layer, an insulating layer, a shielding layer, and a protective layer.
- the cable core may have a single core or a plurality of cores.
- the superconducting cable to which the method of the present invention is applied may be a direct current cable or an alternating current cable.
- the thermal insulating tube is held with an end of the cable core exposed from the thermal insulating tube.
- an end of the thermal insulating tube is cut by a predetermined length.
- the outer pipe be shorter than the inner pipe, and a vacuum be sealed at an end of the outer pipe. In the case of this structure, the vacuum sealing work at an end of the outer pipe can be easily performed.
- the exposing work of the cable core can be performed without cutting the inner and outer pipes and breaking the vacuum of the thermal insulating tube.
- the inner pipe 110 of the thermal insulating tube 100 is long, the outer pipe 120 thereof is short, and an evacuation port 130 is formed at an end of the outer pipe 120. Through this evacuation port 130, the space between the inner and outer pipes 110 and 120 is evacuated. Thereafter, a cap 300 is attached to the end of the cable core 200 extending farther than the inner pipe 110.
- a straight inner pipe 111 and a straight outer pipe 121 are soldered between the end of the inner pipe 110 and the cap 300 and between the end of the outer pipe and the cap 300, respectively.
- the thermal insulating tube from the cap 300 to the end of the outer pipe is cut, the vacuum of the thermal insulating tube 100 is not broken.
- the thermal insulating tube may have a structure in which the outer pipe is longer than the inner pipe, and a vacuum is sealed at an end of the inner pipe. Also in the case of this structure, if the place to be cut is only an end of the outer pipe, the exposing work of the cable core can be performed without cutting the inner and outer pipes and breaking the vacuum of the thermal insulating tube.
- the thermal insulating tube After the cable core is exposed from the thermal insulating tube, the thermal insulating tube is held in this state. By holding the thermal insulating tube, the thermal insulating tube is prevented from moving together with the cable core when the cable core is drawn out of the thermal insulating tube or pushed back into the thermal insulating tube as described below.
- the thermal insulating tube is fixed, using an appropriate fixing jig, to the ground (or a building fixed to the ground, for example, the floor or the wall of a manhole).
- the process of drawing the cable core out of the thermal insulating tube is performed.
- This drawing process is effective particularly in the case of a multicore cable including a plurality of cable cores twisted together. Normally, there is a slack in the stranding of a multicore cable, and therefore the clearance between the thermal insulating tube and a multicore cable is small. It is difficult to perform the process of returning the cable cores to the thermal insulating tube described below. When drawn out and stretched, the cable cores twisted together are tightened, and the stranding outside diameter is reduced.
- the cable cores when the cable cores are pushed back into the thermal insulating tube, the reduced stranding outside diameter returns to the original diameter, and thereby the cable cores can be returned into the thermal insulating tube by a predetermined length. Therefore, in the case of a multicore cable, it is preferable to draw the cable cores out of the thermal insulating tube by a predetermined length. In the case of a single core cable, this drawing process need not be performed. Normally, in the case of a single core cable, the clearance between the thermal insulating tube and the cable core is comparatively large. Therefore, the cable core meanders in the thermal insulating tube, and thereby the below-described process of pushing back the cable core into the thermal insulating tube can be performed. Of course, it is possible to draw out the cable core of a single core cable so as to stretch the cable core meandering in the thermal insulating tube.
- the predetermined length in this drawing is at least a length sufficient to reduce the slack of the cable core and the connecting structure located between the thermal insulating tubes of the superconducting cables abutted against each other.
- the predetermined length by which the cable core is drawn out in the drawing process be at least the increase in length by which the cable core is lengthened in the longitudinal direction of the cable core due to the compressing connection.
- This drawing process is preferably performed while the tensile load when the cable core is drawn out is measured. By measuring the tensile load, under how much load the cable core is drawn out can be checked.
- a connecting structure is formed at the end of the cable core.
- a connecting structure is formed with the cable core drawn out of the thermal insulating tube.
- the term "connecting structure” refers to a component of a connecting part formed for connecting a cable core to its counterpart.
- the term “connecting part” refers to the entire structure for connecting a superconducting cable to its counterpart. Normally, superconducting cable cores whose layers are exposed in a stepwise manner are abutted against each other, the formers and the conductive layers are connected using a sleeve, and a connecting structure is formed. At this time, the formers are connected by compressing the sleeve .
- an insulating tape is wound on the sleeve so as to form a reinforced insulating part.
- a coolant vessel is formed outside the reinforced insulating part.
- a coolant vessel accommodating all reinforced insulating parts is formed.
- a vacuumed vessel is formed outside the coolant vessel so as to form a connecting part.
- the connecting structure formed in the method of the present invention is typically a connecting structure in an intermediate connecting part for connecting superconducting cables.
- a connecting structure in a terminal connecting part is also included therein.
- cores may be fixed in a connecting box or disposed slidably depending on the thermal expansion or contraction in a connecting box.
- the cable core is pushed back into the thermal insulating tube.
- this push back process is realized by releasing the tension.
- the cable core In the case of a single core cable, there is only a single core in the thermal insulating tube, and the clearance therebetween is comparatively large. Therefore, after a connecting structure is formed, if the cable core is pushed into the thermal insulating tube, the cable core meanders in the thermal insulating tube, and thereby the cable core can be pushed back by a predetermined length.
- the cable cores twisted together Since there is generally a certain amount of slack in the cable cores twisted together, when drawn out and stretched, the cable cores twisted together are tightened, and the stranding outside diameter is reduced. When the cable cores are returned into the thermal insulating tube, the reduced stranding outside diameter returns to the original diameter, and thereby the cable cores can be returned into the thermal insulating tube by a predetermined length.
- the predetermined length in this push back process is at least a length sufficient to reduce the slack of the cable core and the connecting structure located between the thermal insulating tubes of the superconducting cables abutted against each other.
- the predetermined length by which the cable core is pushed back in the push back process be at least the increase in length by which the cable core is lengthened in the longitudinal direction of the cable core due to the compressing connection.
- This push back process is preferably performed while the pressing load when the cable core is returned is measured. By measuring the pressing load, under how much load the cable core is pushed back can be checked.
- the above-described drawing of the cable core out of the thermal insulating tube or pushing back into the thermal insulating tube can be performed using an appropriate strainer, such as a jack or a winch, or a driving mechanism using a screw.
- drawing or pushing back can be performed without displacing the cores relative to each other.
- this grasping tool include an elastic part fitted on the outer periphery of the cable core, and a fastening tool grasping the elastic part.
- This elastic part is, for example, a cylindrical elastic part having a fitting hole fitting the outline of the plurality of cores.
- This elastic part preferably has a cut in the longitudinal direction so as to be easily fitted on the outer periphery of the core.
- such an elastic part is preferably formed of a highly-flexible material such as rubber.
- the fastening tool fastens the elastic part and thereby contributes to obtaining a sufficient grasping force.
- the fastening tool is, for example, a pair of semicylindrical division pieces fitted together so as to form a cylinder. On both side edges of each division piece are provided flat-plate-like connecting plates extending outward in the radius direction. By fitting the division pieces together so that they face each other, passing bolts through the connecting plates, and tightening nuts, the cable core can be firmly grasped by the elastic part between the cable core and the fastening tool. Between the connecting plates facing each other, springs may be disposed so that elastic force is applied between the connecting plates.
- stoppers may be provided in the elastic part.
- the stoppers are, for example, large diameter portions provided at both ends of the elastic part.
- the diameter of the large diameter portions is larger than that of the fastening tool.
- the large diameter portions are located at both ends of the fastening tool when the elastic part is grasped by the fastening tool.
- a drawing mechanism (push back mechanism) using the above-described grasping tool is preferably capable of driving the fastening tool along the axial direction. If the fastening tool can be moved in the axial direction, a tensile force (pressing force) along the axial direction can be exerted on the grasped cable core.
- a mechanism is, for example, a driving mechanism using a screw.
- a protrusion along the axial direction is provided on the outer periphery of the fastening tool, and a female screw hole is provided in this protrusion.
- a ball screw is screwed into this insertion hole. An end of the ball screw is held by the fixing jig used for holding the thermal insulating tube.
- a driving mechanism having this structure by rotating the ball screw, the grasping tool can be moved back and forth in the axial direction, and the grasped cable core can be drawn out of and pushed back into the thermal insulating tube.
- a rod may be used instead of a ball screw.
- This rod is inserted into the insertion hole provided in the protrusion of the fastening tool so that the fastening tool can slide along the rod.
- a wire is attached to this fastening tool. The wire is taken up, for example, with a winch, and thereby the fastening tool is moved back and forth along the rod.
- the cable core grasped by the fastening tool can be drawn out of and pushed back into the thermal insulating tube.
- the method of the present invention has the following advantages.
- the cable core By drawing the cable core out of the thermal insulating tube by a predetermined length in advance before a connecting structure is formed, the cable core can be easily returned into the thermal insulating tube in a subsequent process.
- the predetermined length by which the cable core is drawn out is at least the increase in length by which the cable core is lengthened in the longitudinal direction of the cable core due to the compressing connection, the cable core can be easily returned to the thermal insulating tube by this increase in length in a subsequent process.
- the cable core When the cable core is drawn out of the thermal insulating tube or pushed back to the thermal insulating tube, by grasping the cable core with a grasping tool and drawing (pressing) this grasping tool, the cable core can be surely drawn out of (pushed back into) the thermal insulating tube.
- the cores can be drawn out of the thermal insulating tube (pushed back to the thermal insulating tube) together.
- FIG. 1 An embodiment of the present invention will now be described with reference to FIG. 1 .
- an intermediate connecting part is formed between three-core superconducting cables each including a thermal insulating tube and three cable cores twisted together and accommodated in the thermal insulating tube.
- the thermal insulating tube 100 of this superconducting cable has a double tube structure of an inner pipe 110 and an outer pipe 120.
- the outer pipe 120 is longer than the inner pipe 110.
- the space between the inner and outer pipes 110 and 120 is sealed at an end of the inner pipe 110.
- the space between both pipes 110 and 120 is a vacuum.
- Each cable core 200 has, in order from the center, a former, a conductive layer, an insulating layer, a shielding layer, and a protective layer.
- the three cable cores 200 twisted together are slackened so that the contraction due to cooling can be absorbed during the operation of the superconducting cable.
- a cap 300 is attached to the ends of the thermal insulating tube 100 and the cable cores 200.
- the end of the thermal insulating tube 100 is cut so as to expose the cable cores 200.
- the part of the outer pipe 120 extending farther than the inner pipe 110 is cut so as not to break the vacuum of the thermal insulating tube 100.
- the fixing jig 400 used in this embodiment has a vertical piece 410 and a horizontal piece 420.
- the vertical piece 410 holds the thermal insulating tube 100 and has a groove in which the cable cores 200 are fitted.
- the horizontal piece 420 supports the vertical piece 410 on the ground.
- a grasping tool 500 is fitted to a not untwisted part of the cable cores 200.
- This grasping tool 500 is a tool used when the cable cores 200 are drawn out of the thermal insulating tube 100 or pushed back to the thermal insulating tube 100.
- This grasping tool 500 includes an elastic part shown in FIG. 2 and a fastening tool 520 shown in FIG. 3 .
- the outer periphery of the elastic part 510 is shaped in a cylindrical surface.
- the elastic part 510 has a grasping hole 511 whose inner periphery fits the outline of the cable cores twisted together.
- the elastic part 510 is formed of chloroprene rubber.
- this elastic part 510 has a cut 512 formed so as to extend from the outer periphery to the inner periphery and along the axial direction. When the elastic part 510 is fitted to the cable cores, this cut 512 is opened, and thereby the elastic part 510 can be fitted to the cable cores from the side.
- the fastening tool 520 includes semicylindrical division pieces 521 fitted together and is configured to fasten the elastic part 510 from the outer periphery.
- Each division piece 521 of this fastening tool 520 has rectangular plate-like connecting pieces 522 formed on both side edges thereof and extending outward in the radius direction.
- Each connecting piece 522 has bolt through holes 523 formed therein.
- each division piece 521 has a protrusion 524 formed at a position of a right angle from the connecting pieces 522.
- the protrusion 524 has an insertion hole 525 formed therein. Trough this insertion hole 525 is passed a slide shaft 530 (see FIG. 1 (D) ). By sliding the fastening tool 520 along the shaft, the held cable cores 510 can be moved relative to the thermal insulating tube 100 in the axial direction.
- one slide shaft is passed through each insertion hole, and one end of the slide shaft 530 is screwed to the fixing jig 400.
- a stopper At the other end of the slide shaft 530 is formed a stopper.
- the other end of the slide shaft 530 partly has a larger diameter so as to prevent the fastening tool 520 from being removed from the slide shaft 530.
- a wire 600 is attached to the fastening tool 520, and the wire 600 is taken up with a winch (not shown).
- the fastening tool 520 grasping the cable cores 200 with the elastic part therebetween moves to the other ends of the slide shafts 530 and is stopped by the stoppers.
- the cable cores 200 are drawn out of the thermal insulating tube 100 by a predetermined length.
- the tensile force exerted on the wire 600 can be measured using a load cell, for example.
- the cable cores 200 are drawn out of the thermal insulating tube 100 by a length slightly larger than the length by which the connecting sleeves are lengthened due to the compression. Due to this drawing, the plurality of cable cores 200 loosely twisted together is tightened, the outside diameter is thereby reduced, and the clearance between the cable cores 200 and the inner periphery of the thermal insulating tube 100 is increased. The drawn-out cable cores 200 are held in this position, and connecting structures 710 are formed.
- FIG. 1 (F) shows a state in which these reinforced insulating layers are formed.
- the drawn-out cable cores are pushed back into the thermal insulating tube.
- the tension of the wire 600 attached to the fastening tool 520 is released, and in this state, the slide shafts 530 are screwed into the fixing jig 400. That is to say, the slide shafts 530 themselves are moved to the left in the figure, and with this movement, the fastening tool 520 is also moved to the left in the figure. Due to this movement, the drawn-out cable cores 200 are pushed back into the thermal insulating tube 100.
- the slide shafts 530 which are parallel to the fastening tool 520, are screwed into the fixing jig 400, and thereby a pressing force along the axial direction can be exerted on the cable cores 200.
- the twist of the cable cores 200 is slackened, and thereby the cable cores 200 twisted together can be easily pushed back into the thermal insulating tube 100.
- the distance by which the cable cores 200 are pushed back is equal to the above distance by which the cable cores 200 are drawn out. This pushing back reduces the slack of the cable cores 200 and the connecting structures 710 disposed between the ends of the thermal insulating tubes of both superconducting cables abutted against each other.
- a coolant vessel 720 accommodating the connecting structures 710 of the three cores together is formed.
- a vacuumed vessel 730 is formed outside the coolant vessel 720.
- the cable cores are drawn out by a predetermined length, and after the formation of connecting structures, the cable cores are pushed back into the thermal insulating tube. This reduces the slack of the cable cores and the connecting structures disposed between the ends of the thermal insulating tubes, and reduces the distance between the connecting structures in the radius direction. Therefore, the outside diameter of the connecting structures can be reduced.
- the cable cores can be pushed into the thermal insulating tube by about 10 mm on one side of the connecting structures by applying an axial power of about 300 to 500 kgf.
- the assembling method of the present invention is suitable for forming a connecting part of superconducting cables.
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Processing Of Terminals (AREA)
- Gas Or Oil Filled Cable Accessories (AREA)
- Manufacturing Of Electrical Connectors (AREA)
Abstract
Description
- The present invention relates to a method for assembling a connecting part of superconducting cables. More specifically, it relates to a method for assembling a connecting part of superconducting cables by which the outside diameter of the connecting part can be reduced.
- As a superconducting cable, there is known a structure in which three cable cores are twisted together and accommodated in a thermal insulating tube (for example, Patent Document 1 and Patent Document 2). These cores have, in order from the center, a former, a conductive layer, an insulating layer, a shielding layer, and a protective layer. Normally, in such a multicore superconducting cable, in order to absorb the thermal contraction during cooling by coolant, the stranding of the cable cores is slackened in advance. In the case where an intermediate connecting part is formed between such superconducting cables, the forming process is performed as shown in
FIG. 5 . - First, one of the superconducting cables to be connected is prepared (
FIG. 5(A) ). Next, one end of thethermal insulating tube 100 of this cable is cut, so as to expose thecable cores 200 from the end of the cutthermal insulating tube 100 by a length necessary for the forming work of the connecting part, with the position of acap 300 attached to the ends of thecable cores 200 being fixed (FIG. 5 (B) ). Next, thethermal insulating tube 100 of the superconducting cable is held in this state. Here, thethermal insulating tube 100 is fixed to the ground with a fixing jig 400 (FIG. 5 (C) ). - The exposed
cable cores 200 are untwisted, and the ends of thecable cores 200 are separated (FIG. 5 (D) ). The same works are performed for the other cable to be connected. Connectingstructures 710 like those described in Patent Document 3 are formed between thecable cores 200 abutted against each other (FIG. 5 (E) ). In the formation of these connectingstructures 710, the formers of the superconducting cables abutted against each other are covered with connecting sheaths, and then the connecting sheaths are compressed. After all connectingstructures 710 ofcores 200 have been formed, acoolant layer 720 covering all these connectingstructures 710 is formed. In addition, avacuumed vessel 730 is formed outside thecoolant vessel 720. Thus, a connectingpart 700 is formed (FIG. 5 (F) ). -
- Patent Document 1: Japanese Unexamined Patent Application Publication No.
2003-249130 FIG. 1 ) - Patent Document 2: Japanese Unexamined Patent Application Publication No.
2002-140944 FIG. 2 ) - Patent Document 3: Japanese Utility Model Application No.
58725/1972 18086/1974 - The above-described method for assembling a connecting part has a problem where the outside diameter of the connecting part is large.
- In order to form the connecting structures, it is necessary to untwist the cable cores and to separate the ends of the cable cores sufficiently to perform the forming work of the connecting structures. Therefore, the cable cores with connecting structures are spaced from each other. In addition, if compression is used for forming the connecting structures, the compressive parts are lengthened in the longitudinal direction with the compression. As a result, the sum of the length of the cable cores exposed between the ends of the thermal insulating tubes in the superconducting cables abutted against each other and the length of the connecting structures after compression is longer than the sum of those lengths before compression. For this reason, the exposed cable cores and the connecting structures are disposed, being slackened in the radius direction of the superconducting cables. This increases the outside diameter of the connecting part.
- The present invention is made in consideration of the above-described circumstances. Its main object is to provide a method for forming a connecting part of superconducting cables by which the outside diameter of the connecting part can be reduced.
- The present invention is a method for assembling a connecting part of superconducting cables, to form a connecting part at an end of a superconducting cable including a thermal insulating tube and a cable core accommodated therein. The method includes the following steps: the step of holding the thermal insulating tube with an end of the cable core exposed from the thermal insulating tube, at the end of the superconducting cable; the step of forming a connecting structure at the end of the cable core; and the step of pushing back the cable core into the thermal insulating tube by a predetermined length.
- According to the method of the present invention, after the connecting structure is formed, the cable core is pushed back into the thermal insulating tube by a predetermined length. Therefore, the slack of the cable core exposed from the thermal insulating tube of the superconducting cable can be reduced. By this reduction in slack, the size in the radius direction of the connecting part can be reduced.
- The method of the present invention will be described in detail.
- The superconducting cables to which the method of the present invention is applied include all cables having a superconductor. Typically, they have a structure in which a cable core is accommodated in a thermal insulating tube. Normally, a thermal insulating tube has a double pipe structure of an inner pipe and an outer pipe. The space between both pipes is evacuated, and a thermal insulation such as a super insulation is disposed there. The cable core can have a structure including, for example, in order from the center, a former, a conductive layer, an insulating layer, a shielding layer, and a protective layer. The cable core may have a single core or a plurality of cores.
- The superconducting cable to which the method of the present invention is applied may be a direct current cable or an alternating current cable.
- In such a superconducting cable, first, the thermal insulating tube is held with an end of the cable core exposed from the thermal insulating tube. In order to expose an end of the cable core from the thermal insulating tube, for example, an end of the thermal insulating tube is cut by a predetermined length. At this time, in the case where the thermal insulating tube has a double tube structure of an inner pipe and an outer pipe, it is preferable that the outer pipe be shorter than the inner pipe, and a vacuum be sealed at an end of the outer pipe. In the case of this structure, the vacuum sealing work at an end of the outer pipe can be easily performed. In addition, if the place to be cut is only an end of the inner pipe, the exposing work of the cable core can be performed without cutting the inner and outer pipes and breaking the vacuum of the thermal insulating tube. In the case of such a cable end, as shown in
FIG. 4 , theinner pipe 110 of thethermal insulating tube 100 is long, theouter pipe 120 thereof is short, and anevacuation port 130 is formed at an end of theouter pipe 120. Through thisevacuation port 130, the space between the inner andouter pipes cap 300 is attached to the end of thecable core 200 extending farther than theinner pipe 110. Next, a straightinner pipe 111 and a straightouter pipe 121 are soldered between the end of theinner pipe 110 and thecap 300 and between the end of the outer pipe and thecap 300, respectively. In the case of a cable end having such a structure, if the thermal insulating tube from thecap 300 to the end of the outer pipe is cut, the vacuum of thethermal insulating tube 100 is not broken. The thermal insulating tube may have a structure in which the outer pipe is longer than the inner pipe, and a vacuum is sealed at an end of the inner pipe. Also in the case of this structure, if the place to be cut is only an end of the outer pipe, the exposing work of the cable core can be performed without cutting the inner and outer pipes and breaking the vacuum of the thermal insulating tube. - After the cable core is exposed from the thermal insulating tube, the thermal insulating tube is held in this state. By holding the thermal insulating tube, the thermal insulating tube is prevented from moving together with the cable core when the cable core is drawn out of the thermal insulating tube or pushed back into the thermal insulating tube as described below. For example, the thermal insulating tube is fixed, using an appropriate fixing jig, to the ground (or a building fixed to the ground, for example, the floor or the wall of a manhole).
- Next, if necessary, the process of drawing the cable core out of the thermal insulating tube is performed. This drawing process is effective particularly in the case of a multicore cable including a plurality of cable cores twisted together. Normally, there is a slack in the stranding of a multicore cable, and therefore the clearance between the thermal insulating tube and a multicore cable is small. It is difficult to perform the process of returning the cable cores to the thermal insulating tube described below. When drawn out and stretched, the cable cores twisted together are tightened, and the stranding outside diameter is reduced. As a result, when the cable cores are pushed back into the thermal insulating tube, the reduced stranding outside diameter returns to the original diameter, and thereby the cable cores can be returned into the thermal insulating tube by a predetermined length. Therefore, in the case of a multicore cable, it is preferable to draw the cable cores out of the thermal insulating tube by a predetermined length. In the case of a single core cable, this drawing process need not be performed. Normally, in the case of a single core cable, the clearance between the thermal insulating tube and the cable core is comparatively large. Therefore, the cable core meanders in the thermal insulating tube, and thereby the below-described process of pushing back the cable core into the thermal insulating tube can be performed. Of course, it is possible to draw out the cable core of a single core cable so as to stretch the cable core meandering in the thermal insulating tube.
- The predetermined length in this drawing is at least a length sufficient to reduce the slack of the cable core and the connecting structure located between the thermal insulating tubes of the superconducting cables abutted against each other. Particularly in the case where a compressing connection is used in the connecting structure, it is preferable that the predetermined length by which the cable core is drawn out in the drawing process be at least the increase in length by which the cable core is lengthened in the longitudinal direction of the cable core due to the compressing connection. By drawing out the cable core by this increase in length, the cable core can be easily pushed back into the thermal insulating tube in a subsequent process, and the slack generated by the increase in length due to compression can be eliminated. Of course, the cable core may be drawn out of the thermal insulating tube by a length exceeding the above increase in length.
- This drawing process is preferably performed while the tensile load when the cable core is drawn out is measured. By measuring the tensile load, under how much load the cable core is drawn out can be checked.
- Next, a connecting structure is formed at the end of the cable core. In the case where the above-described drawing process is performed, a connecting structure is formed with the cable core drawn out of the thermal insulating tube. The term "connecting structure" refers to a component of a connecting part formed for connecting a cable core to its counterpart. The term "connecting part" refers to the entire structure for connecting a superconducting cable to its counterpart. Normally, superconducting cable cores whose layers are exposed in a stepwise manner are abutted against each other, the formers and the conductive layers are connected using a sleeve, and a connecting structure is formed. At this time, the formers are connected by compressing the sleeve . Thereafter, an insulating tape is wound on the sleeve so as to form a reinforced insulating part. In the case of a single core cable, a coolant vessel is formed outside the reinforced insulating part. In the case of a multicore cable, a coolant vessel accommodating all reinforced insulating parts is formed. In addition, a vacuumed vessel is formed outside the coolant vessel so as to form a connecting part.
- The connecting structure formed in the method of the present invention is typically a connecting structure in an intermediate connecting part for connecting superconducting cables. However, a connecting structure in a terminal connecting part is also included therein. In the case of an intermediate connecting part, cores may be fixed in a connecting box or disposed slidably depending on the thermal expansion or contraction in a connecting box.
- Next, the cable core is pushed back into the thermal insulating tube. In the case where the drawing process is performed using an appropriate strainer such as a jack, this push back process is realized by releasing the tension. In the case of a single core cable, there is only a single core in the thermal insulating tube, and the clearance therebetween is comparatively large. Therefore, after a connecting structure is formed, if the cable core is pushed into the thermal insulating tube, the cable core meanders in the thermal insulating tube, and thereby the cable core can be pushed back by a predetermined length. Even in the case of a multicore cable, such as a two-core or three-core cable, in which a plurality of cable cores are twisted together and accommodated in a thermal insulating tube, if the clearance between the thermal insulating tube and the cable cores twisted together is comparatively large, the cable cores can be returned into the thermal insulating tube by a predetermined length. However, normally, this clearance is not sufficient, and it is actually difficult to return the cable core into the thermal insulating tube by a predetermined length. In this case, it is preferable to draw the cable cores twisted together out of the thermal insulating tube by a predetermined length in advance. Since there is generally a certain amount of slack in the cable cores twisted together, when drawn out and stretched, the cable cores twisted together are tightened, and the stranding outside diameter is reduced. When the cable cores are returned into the thermal insulating tube, the reduced stranding outside diameter returns to the original diameter, and thereby the cable cores can be returned into the thermal insulating tube by a predetermined length.
- The predetermined length in this push back process is at least a length sufficient to reduce the slack of the cable core and the connecting structure located between the thermal insulating tubes of the superconducting cables abutted against each other. Particularly in the case where a compressing connection is used in the connecting structure, it is preferable that the predetermined length by which the cable core is pushed back in the push back process be at least the increase in length by which the cable core is lengthened in the longitudinal direction of the cable core due to the compressing connection. By pushing back the cable core by this increase in length, the slack generated by the increase in length due to compression can be eliminated. In the case where the cable core is drawn out by a length larger than or equal to this increase in length, it is preferable that the length by which the cable core is pushed back be equal to the length by which the cable core is drawn out.
- This push back process is preferably performed while the pressing load when the cable core is returned is measured. By measuring the pressing load, under how much load the cable core is pushed back can be checked.
- The above-described drawing of the cable core out of the thermal insulating tube or pushing back into the thermal insulating tube can be performed using an appropriate strainer, such as a jack or a winch, or a driving mechanism using a screw. In this case, it is preferable to grasp the cable core with a grasping tool, to draw the grasping tool, and to thereby draw the cable core out of the thermal insulating tube. Particularly in the case where a plurality of cores are grasped, by using a grasping tool capable of holding a plurality of cores together, drawing or pushing back can be performed without displacing the cores relative to each other.
- It is preferable that this grasping tool include an elastic part fitted on the outer periphery of the cable core, and a fastening tool grasping the elastic part. This elastic part is, for example, a cylindrical elastic part having a fitting hole fitting the outline of the plurality of cores. This elastic part preferably has a cut in the longitudinal direction so as to be easily fitted on the outer periphery of the core. In consideration of fittability, such an elastic part is preferably formed of a highly-flexible material such as rubber.
- The fastening tool fastens the elastic part and thereby contributes to obtaining a sufficient grasping force. The fastening tool is, for example, a pair of semicylindrical division pieces fitted together so as to form a cylinder. On both side edges of each division piece are provided flat-plate-like connecting plates extending outward in the radius direction. By fitting the division pieces together so that they face each other, passing bolts through the connecting plates, and tightening nuts, the cable core can be firmly grasped by the elastic part between the cable core and the fastening tool. Between the connecting plates facing each other, springs may be disposed so that elastic force is applied between the connecting plates. In addition, in order to prevent the elastic part from being displaced in the longitudinal direction when the elastic part is fastened with the fastening tool, stoppers may be provided in the elastic part. Specifically, the stoppers are, for example, large diameter portions provided at both ends of the elastic part. The diameter of the large diameter portions is larger than that of the fastening tool. The large diameter portions are located at both ends of the fastening tool when the elastic part is grasped by the fastening tool.
- A drawing mechanism (push back mechanism) using the above-described grasping tool is preferably capable of driving the fastening tool along the axial direction. If the fastening tool can be moved in the axial direction, a tensile force (pressing force) along the axial direction can be exerted on the grasped cable core. Specifically, such a mechanism is, for example, a driving mechanism using a screw. For example, a protrusion along the axial direction is provided on the outer periphery of the fastening tool, and a female screw hole is provided in this protrusion. A ball screw is screwed into this insertion hole. An end of the ball screw is held by the fixing jig used for holding the thermal insulating tube. In a driving mechanism having this structure, by rotating the ball screw, the grasping tool can be moved back and forth in the axial direction, and the grasped cable core can be drawn out of and pushed back into the thermal insulating tube.
- Instead of a ball screw, a rod may be used. This rod is inserted into the insertion hole provided in the protrusion of the fastening tool so that the fastening tool can slide along the rod. For example, a wire is attached to this fastening tool. The wire is taken up, for example, with a winch, and thereby the fastening tool is moved back and forth along the rod. Thus, the cable core grasped by the fastening tool can be drawn out of and pushed back into the thermal insulating tube.
- The method of the present invention has the following advantages.
- (1) In the place where a connecting structure of superconducting cables is formed, by returning the cable core into the thermal insulating tube by a predetermined length, the slack of the cable core exposed from the thermal insulating tube of a superconducting cable can be reduced. By the reduction of this slack, the size in the radius direction of the connecting part can be reduced.
- (2) By drawing the cable core out of the thermal insulating tube by a predetermined length in advance before a connecting structure is formed, the cable core can be easily returned into the thermal insulating tube in a subsequent process. In particular, when the predetermined length by which the cable core is drawn out is at least the increase in length by which the cable core is lengthened in the longitudinal direction of the cable core due to the compressing connection, the cable core can be easily returned to the thermal insulating tube by this increase in length in a subsequent process.
- (3) In the case where a compressing connection is used for forming a connecting structure, when the predetermined length by which the cable core is returned in the returning process is at least the increase in length by which the cable core is lengthened in the longitudinal direction of the cable core due to the compressing connection, the slack generated by this increase in length can be eliminated.
- (4) When the cable core is drawn out of the thermal insulating tube or pushed back to the thermal insulating tube, by grasping the cable core with a grasping tool and drawing (pressing) this grasping tool, the cable core can be surely drawn out of (pushed back into) the thermal insulating tube. In particular, in the case of a plurality of cable cores, the cores can be drawn out of the thermal insulating tube (pushed back to the thermal insulating tube) together.
- (5) In the case where a grasping tool is used for drawing the cable core out of the thermal insulating tube (pushing back the cable core into the thermal insulating tube), when the grasping tool includes an elastic part fitted on the outer periphery of the cable core and a fastening tool grasping this elastic part, the cable core can be firmly grasped and moved without being damaged.
- (6) In at least one of the push back process and the drawing process, by measuring the load during the drawing (pushing back) of the cable core, under how much load the cable core is drawn (pushed back) can be checked.
- (7) In the case of a plurality of cable cores twisted together, by using the tightening of the slack of the stranding, the superconducting cable can be easily drawn out of or pushed back to the thermal insulating tube.
-
-
FIG. 1 is a process explaining view showing the assembling method of the present invention. -
FIG. 2 is a schematic perspective view of an elastic part used in the method of the present invention. -
FIG. 3 is a schematic perspective view of a fastening part used in the method of the present invention. -
FIG. 4 is a schematic partial vertical sectional view of an end of a superconducting cable used in the method of the present invention. -
FIG. 5 is a process explaining view showing a conventional assembling method. -
- 100
- thermal insulating tube
- 110
- inner pipe
- 120
- outer pipe
- 130
- evacuation port
- 111
- straight inner pipe
- 121
- straight outer pipe
- 200
- cable core
- 300
- cap
- 400
- fixing jig
- 410
- vertical piece
- 420
- horizontal piece
- 500
- grasping tool
- 510
- elastic part
- 511
- grasping hole
- 512
- cut
- 520
- fastening tool
- 521
- division piece
- 522
- connecting piece
- 523
- through hole
- 524
- protrusion
- 525
- insertion hole
- 530
- slide shaft
- 600
- wire
- 700
- connecting part
- 710
- connecting structure
- 720
- coolant vessel
- 730
- vacuumed vessel
- An embodiment of the present invention will now be described with reference to
FIG. 1 . Here, for example, the case where an intermediate connecting part is formed between three-core superconducting cables each including a thermal insulating tube and three cable cores twisted together and accommodated in the thermal insulating tube. - As shown in
FIG. 1 (A) , one of the superconducting cables to be connected is prepared. The thermal insulatingtube 100 of this superconducting cable has a double tube structure of aninner pipe 110 and anouter pipe 120. Theouter pipe 120 is longer than theinner pipe 110. The space between the inner andouter pipes inner pipe 110. The space between bothpipes cable core 200 has, in order from the center, a former, a conductive layer, an insulating layer, a shielding layer, and a protective layer. The threecable cores 200 twisted together are slackened so that the contraction due to cooling can be absorbed during the operation of the superconducting cable. Acap 300 is attached to the ends of the thermal insulatingtube 100 and thecable cores 200. - Next, as shown in
FIG. 1 (B) , the end of the thermal insulatingtube 100 is cut so as to expose thecable cores 200. In this embodiment, only the part of theouter pipe 120 extending farther than theinner pipe 110 is cut so as not to break the vacuum of the thermal insulatingtube 100. - Next, as shown in
FIG. 1 (C) , the end of the thermal insulatingtube 100 is held on the ground with a fixingjig 400. The fixingjig 400 used in this embodiment has avertical piece 410 and ahorizontal piece 420. Thevertical piece 410 holds the thermal insulatingtube 100 and has a groove in which thecable cores 200 are fitted. Thehorizontal piece 420 supports thevertical piece 410 on the ground. - Next, as shown in
FIG. 1 (D) , thecap 300 at the ends of the cable cores is detached, and then the ends of thecable cores 200 are untwisted and separated sufficiently to form connecting structures. Next, a graspingtool 500 is fitted to a not untwisted part of thecable cores 200. This graspingtool 500 is a tool used when thecable cores 200 are drawn out of the thermal insulatingtube 100 or pushed back to the thermal insulatingtube 100. - This grasping
tool 500 includes an elastic part shown inFIG. 2 and afastening tool 520 shown inFIG. 3 . The outer periphery of theelastic part 510 is shaped in a cylindrical surface. Theelastic part 510 has agrasping hole 511 whose inner periphery fits the outline of the cable cores twisted together. In this embodiment, theelastic part 510 is formed of chloroprene rubber. In addition, thiselastic part 510 has acut 512 formed so as to extend from the outer periphery to the inner periphery and along the axial direction. When theelastic part 510 is fitted to the cable cores, thiscut 512 is opened, and thereby theelastic part 510 can be fitted to the cable cores from the side. - The
fastening tool 520 includessemicylindrical division pieces 521 fitted together and is configured to fasten theelastic part 510 from the outer periphery. Eachdivision piece 521 of thisfastening tool 520 has rectangular plate-like connectingpieces 522 formed on both side edges thereof and extending outward in the radius direction. Each connectingpiece 522 has bolt throughholes 523 formed therein. By fitting bothdivision pieces 521 together so that the connectingpieces 522 face each other, inserting bolts into the throughholes 523, and tightening nuts, the threecable cores 510 can be fastened together without being damaged and can be firmly held. In this embodiment, between the connectingpieces 523 facing each other, the bolts are received in compression springs 524, whose elastic force counters the fastening force so as not to damage thecable cores 510. - In addition, each
division piece 521 has aprotrusion 524 formed at a position of a right angle from the connectingpieces 522. Theprotrusion 524 has aninsertion hole 525 formed therein. Trough thisinsertion hole 525 is passed a slide shaft 530 (seeFIG. 1 (D) ). By sliding thefastening tool 520 along the shaft, the heldcable cores 510 can be moved relative to the thermal insulatingtube 100 in the axial direction. - In this embodiment, as shown in
FIG. 1 (D) , one slide shaft is passed through each insertion hole, and one end of theslide shaft 530 is screwed to the fixingjig 400. At the other end of theslide shaft 530 is formed a stopper. Specifically, the other end of theslide shaft 530 partly has a larger diameter so as to prevent thefastening tool 520 from being removed from theslide shaft 530. - In this state, as shown in
FIG. 1 (E) , awire 600 is attached to thefastening tool 520, and thewire 600 is taken up with a winch (not shown). With this taking up, thefastening tool 520 grasping thecable cores 200 with the elastic part therebetween moves to the other ends of theslide shafts 530 and is stopped by the stoppers. By further taking up thewire 600, thecable cores 200 are drawn out of the thermal insulatingtube 100 by a predetermined length. At this time, the tensile force exerted on thewire 600 can be measured using a load cell, for example. - In this embodiment, when the below-described connecting
structures 710 are formed, thecable cores 200 are drawn out of the thermal insulatingtube 100 by a length slightly larger than the length by which the connecting sleeves are lengthened due to the compression. Due to this drawing, the plurality ofcable cores 200 loosely twisted together is tightened, the outside diameter is thereby reduced, and the clearance between thecable cores 200 and the inner periphery of the thermal insulatingtube 100 is increased. The drawn-outcable cores 200 are held in this position, and connectingstructures 710 are formed. - The above-described processes of
FIG. 1 (A) to FIG. 1 (E) are also performed for the other superconducting cable to be connected. As shown inFIG. 1 (F) , the cable cores of one superconducting cable and the cable core of the other superconducting cable are connected via connectingstructures 710. In each connectingstructure 710, formers and conductive layers abutted against each other are covered with a connecting sleeve. The formers are connected by compressing the connecting sleeve. The conductive layers are connected by solder interposed between the conductive layers and the connecting sleeve. After this compressing connection via the connecting sleeve is completed, an insulating tape is wound around the compressing connection part to form a reinforced insulating layer.FIG. 1 (F) shows a state in which these reinforced insulating layers are formed. - Next, as shown in
FIG. 1 (G) , the drawn-out cable cores are pushed back into the thermal insulating tube. In this embodiment, the tension of thewire 600 attached to thefastening tool 520 is released, and in this state, theslide shafts 530 are screwed into the fixingjig 400. That is to say, theslide shafts 530 themselves are moved to the left in the figure, and with this movement, thefastening tool 520 is also moved to the left in the figure. Due to this movement, the drawn-outcable cores 200 are pushed back into the thermal insulatingtube 100. In this embodiment, theslide shafts 530, which are parallel to thefastening tool 520, are screwed into the fixingjig 400, and thereby a pressing force along the axial direction can be exerted on thecable cores 200. By exerting this pressing force, the twist of thecable cores 200 is slackened, and thereby thecable cores 200 twisted together can be easily pushed back into the thermal insulatingtube 100. The distance by which thecable cores 200 are pushed back is equal to the above distance by which thecable cores 200 are drawn out. This pushing back reduces the slack of thecable cores 200 and the connectingstructures 710 disposed between the ends of the thermal insulating tubes of both superconducting cables abutted against each other. - After the
cable cores 200 have been pushed back into the thermal insulatingtube 100, as shown inFIG. 1 (H) , acoolant vessel 720 accommodating the connectingstructures 710 of the three cores together is formed. In addition, a vacuumedvessel 730 is formed outside thecoolant vessel 720. Thus, the formation of a connectingpart 700 is completed. - As described above, the cable cores are drawn out by a predetermined length, and after the formation of connecting structures, the cable cores are pushed back into the thermal insulating tube. This reduces the slack of the cable cores and the connecting structures disposed between the ends of the thermal insulating tubes, and reduces the distance between the connecting structures in the radius direction. Therefore, the outside diameter of the connecting structures can be reduced.
- In the above-described embodiment, if the straight part of the superconducting cable is about 3 m, the cable cores can be pushed into the thermal insulating tube by about 10 mm on one side of the connecting structures by applying an axial power of about 300 to 500 kgf.
- The assembling method of the present invention is suitable for forming a connecting part of superconducting cables.
Claims (10)
- A method for assembling a connecting part of superconducting cables, to form a connecting part (700) at an end of a superconducting cable including a thermal insulating tube (100) and a cable core (200) accommodated therein, characterized in that the method comprises the steps of:holding the thermal insulating tube (100) with an end of the cable core (200) exposed from the thermal insulating tube (100), at the end of the superconducting cable; subsequentlyforming a connecting structure (710) at the end of the cable core (200); and thenpushing back the cable core (200) into the thermal insulating tube (100) by a predetermined length.
- The method for assembling a connecting part of superconducting cables according to Claim 1, further comprising, between the step of holding the thermal insulating tube (100) and the step of forming a connecting structure (710), the step of drawing the cable core (200) out of the thermal insulating tube (100) by a predetermined length.
- The method for assembling a connecting part of superconducting cables according to Claim 1, wherein a compressing connection is used in the step of forming a connecting structure (710), and the predetermined length by which the cable core (200) is returned in the push back step is at least a length by which the cable core (200) is lengthened in the longitudinal direction of the cable core (200) due to the compressing connection.
- The method for assembling a connecting part of superconducting cables according to Claim 2, wherein a compressing connection is used in the step of forming a connecting structure (710), and the predetermined length by which the cable core (200) is drawn out in the drawing step is at least a length by which the cable core (200) is lengthened in the longitudinal direction of the cable core due (200) to the compressing connection.
- The method for assembling a connecting part of superconducting cables according to Claim 1, wherein, in the push back step, the cable core (200) is grasped by a grasping tool (500), the grasping tool (500) is pressed, and thereby the cable core (200) is returned to the thermal insulating tube (100).
- The method for assembling a connecting part of superconducting cables according to Claim 2, wherein, in the drawing step, the cable core (200) is grasped by a grasping tool (500), the grasping tool (500) is drawn, and thereby the cable core (200) is drawn out of the thermal insulating tube (100).
- The method for assembling a connecting part of superconducting cables according to Claim 5 or 6, wherein the grasping tool (500) includes an elastic part (510) fitted on the outer periphery of the cable core (200) and a fastening tool (520) grasping the elastic part (510).
- The method for assembling a connecting part of superconducting cables according to Claim 1, wherein the push back step is performed while the pressing load when the cable core (200) is pushed back is measured.
- The method for assembling a connecting part of superconducting cables according to Claim 2, wherein, the drawing step is performed while the tensile load when the cable core (200) is drawn out is measured.
- The method for assembling a connecting part of superconducting cables according to Claim 2, wherein the cable core (200) includes a plurality of cores twisted together.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005005712A JP4609704B2 (en) | 2005-01-12 | 2005-01-12 | How to assemble superconducting cable connections |
PCT/JP2005/020903 WO2006075442A1 (en) | 2005-01-12 | 2005-11-15 | Method for assembling superconducting cable connecting section |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1837969A1 EP1837969A1 (en) | 2007-09-26 |
EP1837969A4 EP1837969A4 (en) | 2011-03-30 |
EP1837969B1 true EP1837969B1 (en) | 2012-01-11 |
Family
ID=36677475
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05806918A Expired - Fee Related EP1837969B1 (en) | 2005-01-12 | 2005-11-15 | Method for assembling superconducting cable connecting section |
Country Status (11)
Country | Link |
---|---|
US (1) | US20080086878A1 (en) |
EP (1) | EP1837969B1 (en) |
JP (1) | JP4609704B2 (en) |
KR (1) | KR20070093420A (en) |
CN (1) | CN101099275B (en) |
CA (1) | CA2593770C (en) |
DK (1) | DK1837969T3 (en) |
HK (1) | HK1111822A1 (en) |
NO (1) | NO20074077L (en) |
TW (1) | TW200632943A (en) |
WO (1) | WO2006075442A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5041133B2 (en) * | 2006-11-17 | 2012-10-03 | 住友電気工業株式会社 | Manufacturing method of multi-core superconducting cable |
JP4826797B2 (en) * | 2007-02-23 | 2011-11-30 | 住友電気工業株式会社 | Superconducting cable line design method and superconducting cable line |
JP2008245343A (en) * | 2007-03-23 | 2008-10-09 | Sumitomo Electric Ind Ltd | Supporting tool for superconducting cable |
CN102104209A (en) * | 2010-12-01 | 2011-06-22 | 江苏亚特电缆有限公司 | Cable cabling joint |
CN102104210A (en) * | 2010-12-01 | 2011-06-22 | 江苏亚特电缆有限公司 | Cabled joint of power cable |
CN102738603B (en) * | 2011-04-02 | 2014-06-11 | 中国科学院高能物理研究所 | Preparation method of NbTi superconducting wire joint |
JP5810925B2 (en) | 2012-01-10 | 2015-11-11 | 住友電気工業株式会社 | Room-temperature insulated superconducting cable connection structure |
EP2961017A1 (en) * | 2014-06-24 | 2015-12-30 | Nexans | Method and assembly for producing a supraconducting cable system |
US9875826B2 (en) * | 2014-11-14 | 2018-01-23 | Novum Industria Llc | Field makeable cryostat/current connections for an HTS tape power cable |
CN109383413A (en) * | 2016-12-08 | 2019-02-26 | 辽宁丹东新弘源农业科技发展有限公司企业技术研究开发中心 | A kind of scalable cable device |
CN107317128B (en) * | 2017-05-22 | 2019-04-30 | 张素平 | A kind of weak current cable connector of Anti-fall |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4918086U (en) * | 1972-05-19 | 1974-02-15 | ||
JPS5238752B2 (en) | 1972-06-08 | 1977-09-30 | ||
US4036617A (en) * | 1975-04-18 | 1977-07-19 | Cryogenic Technology, Inc. | Support system for an elongated cryogenic envelope |
JPS60147940U (en) * | 1984-03-09 | 1985-10-01 | 古河電気工業株式会社 | Cable core restraint device for pipe type cable |
JPH0789690B2 (en) * | 1988-08-05 | 1995-09-27 | 財団法人電力中央研究所 | How to install a cryogenic cable |
JP2540706B2 (en) * | 1992-12-21 | 1996-10-09 | 東京電力株式会社 | How to connect power cable conductors |
JPH08251794A (en) * | 1995-03-06 | 1996-09-27 | Sumitomo Electric Ind Ltd | Assembly equipment for prefabricated connected portion for power cable |
SE9704424D0 (en) * | 1997-02-03 | 1997-11-28 | Asea Brown Boveri | Device for cable joints and rotating electric machine comprising the device |
JP3057028B2 (en) * | 1997-05-28 | 2000-06-26 | 三菱電線工業株式会社 | Method and apparatus for assembling connection part for power cable |
JP3471670B2 (en) * | 1999-08-18 | 2003-12-02 | 中部電力株式会社 | Pipeline cable restraint |
JP2002140944A (en) | 2000-10-31 | 2002-05-17 | Sumitomo Electric Ind Ltd | Superconductive cable |
JP2002171653A (en) * | 2000-12-06 | 2002-06-14 | Kansai Electric Power Co Inc:The | Tool and method for gripping cable |
JP4482851B2 (en) | 2001-12-18 | 2010-06-16 | 住友電気工業株式会社 | DC superconducting cable |
JP4191544B2 (en) * | 2003-06-19 | 2008-12-03 | 住友電気工業株式会社 | Superconducting cable joint structure |
JP2005012915A (en) * | 2003-06-19 | 2005-01-13 | Sumitomo Electric Ind Ltd | Connection structure of superconductive cable and insulated spacer for connecting superconductive cable |
-
2005
- 2005-01-12 JP JP2005005712A patent/JP4609704B2/en not_active Expired - Fee Related
- 2005-11-15 KR KR1020077015851A patent/KR20070093420A/en active IP Right Grant
- 2005-11-15 DK DK05806918.8T patent/DK1837969T3/en active
- 2005-11-15 CA CA2593770A patent/CA2593770C/en not_active Expired - Fee Related
- 2005-11-15 WO PCT/JP2005/020903 patent/WO2006075442A1/en active Application Filing
- 2005-11-15 EP EP05806918A patent/EP1837969B1/en not_active Expired - Fee Related
- 2005-11-15 US US11/794,801 patent/US20080086878A1/en not_active Abandoned
- 2005-11-15 CN CN200580046144XA patent/CN101099275B/en not_active Expired - Fee Related
-
2006
- 2006-01-06 TW TW095100550A patent/TW200632943A/en unknown
-
2007
- 2007-08-07 NO NO20074077A patent/NO20074077L/en not_active Application Discontinuation
-
2008
- 2008-03-06 HK HK08102657.2A patent/HK1111822A1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DK1837969T3 (en) | 2012-05-07 |
US20080086878A1 (en) | 2008-04-17 |
CN101099275B (en) | 2010-05-12 |
CA2593770C (en) | 2012-09-11 |
EP1837969A4 (en) | 2011-03-30 |
TW200632943A (en) | 2006-09-16 |
WO2006075442A1 (en) | 2006-07-20 |
NO20074077L (en) | 2007-08-07 |
EP1837969A1 (en) | 2007-09-26 |
KR20070093420A (en) | 2007-09-18 |
CA2593770A1 (en) | 2006-07-20 |
HK1111822A1 (en) | 2008-08-15 |
CN101099275A (en) | 2008-01-02 |
JP2006197702A (en) | 2006-07-27 |
JP4609704B2 (en) | 2011-01-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1837969B1 (en) | Method for assembling superconducting cable connecting section | |
US7498519B2 (en) | Joint for superconducting cable | |
CN101091294B (en) | Method for assembling interconnecting structure for superconducting cable | |
JP6853941B2 (en) | Assembly parts of compression connection members, compression connection structure of transmission lines, and construction method of compression connection members | |
JP2017135786A (en) | Assembly component for compression type anchor clamp, anchor structure for power line, and construction method for compression type anchor clamp | |
JP4716246B2 (en) | Superconducting cable | |
EP1223590B1 (en) | Method of manufacturing superconducting cable | |
JP5019118B2 (en) | Superconducting cable end forming method | |
CN1516912A (en) | Phase separator jig for superconductive cables and phase separator structure for superconductive cables | |
JP2009124855A (en) | End structure of superconducting cable | |
US3641658A (en) | Process for coupling to a connecting element an elongated flexible member including lines for remote transmission of power or data | |
JP2008287897A (en) | Superconductive cable | |
CN221262738U (en) | Detachable cable connector | |
CN217506925U (en) | Mining rubber sleeve cable of long-life ageing resistance | |
CN210535849U (en) | Power cable connector | |
KR101709349B1 (en) | Connection Tool of Armor Electric Power | |
CN118100082A (en) | High-voltage submarine cable rush-repair connector and installation method thereof | |
KR20060097229A (en) | Spacer for stranding multi cores and stranding method using thereof | |
KR19980078282A (en) | Optical unit insertion type conductor connection method of optical composite power cable | |
KR20070063752A (en) | An anti-slip device for connecting steel core of steel cored aluminium strand for overhead electric power distribution | |
JP2008243621A (en) | Terminal structure of superconductive cable | |
JPS6048965B2 (en) | How to connect aluminum sheathed cables with the same diameter | |
JPH0669910U (en) | Connection of metal tube with plastic coated filament |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20070709 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE DK FR |
|
DAX | Request for extension of the european patent (deleted) | ||
RBV | Designated contracting states (corrected) |
Designated state(s): DE DK FR |
|
A4 | Supplementary search report drawn up and despatched |
Effective date: 20110301 |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: H02G 15/24 20060101ALI20110627BHEP Ipc: H02G 1/14 20060101AFI20110627BHEP Ipc: H01B 13/00 20060101ALI20110627BHEP |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE DK FR |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602005032186 Country of ref document: DE Effective date: 20120315 |
|
REG | Reference to a national code |
Ref country code: DK Ref legal event code: T3 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20121012 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 602005032186 Country of ref document: DE Effective date: 20121012 |
|
REG | Reference to a national code |
Ref country code: DK Ref legal event code: EBP |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20130731 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 602005032186 Country of ref document: DE Effective date: 20130601 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20130601 Ref country code: DK Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20121130 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20121130 |